Drill sharpener, die, gager, and former.



C. L. LAWTON. DRILL SHARPENER, DIE, GAGER, AND FORMER.

APPLICATION FILED ocr.21, 191s.

Patented June 13, 1916.

2 SHEETSSHEET l- C. L. LAWTON. omu. SHABPENER, DIE, GAGER, AND FORMER.

APPucAnbnmw our. 21. I215.

I Patanted June 13, 1916 2 SHEETSSHEET 2.

A; mun /0W,

menace.

CHARLES L. LAWTON, OE HA NCOCK, MlIGHIGAIt.

DRILL SHARPENEB, DIE, GAG-ER, AND FORMER.

Specification of Letters Eatent.

Patented June 113, 1916.

Application flied October 21, 1915. Serial No. 57,157.

To all whom it may concern:

Be it known that 1, Cinema L. LAw'roN, a citizen of the United States,residing at Hancock, in the county of Houghton and State of Michigan,have invented a new and useful Drill Sharpener, Die, Gager, and Former,of which'the following is a specification.

This invention relates to means for sharpening rock drills and itsobjects is to provide a device whereby the proper Width of the bits ofdrilfs for any desired depth can be quickly and easily secured.

This invention consists, in combination with a pair of dies for shapingthe bits of drills, of a novel adjustable gage whereby a proper width ofthe Wings of the bits of drills may be positively assured.

in the accompanying drawings, Figure 1 is a side elevation of a drillsharpening machine. Fig. 2 is a front elevation of the die blocks and myimproved drill gage. Fig. 3 is a plan and Fig. 4 is a rear elevation ofa die block. Fig. 5 is a plan of my improved drill gage connected to adie block. Fig. 6 is a view of the same device, partly in elevation andpartly in section. Fig. 7 is a rear elevation of another type of dieblcch'.

Similar reference characters refer to like parts throughout the severalviews.

The drills used on any particular piece of rock work or at anyparticular mine are usually all made of one size of drill bar. Whereholes are to, be drilled more than about two feet deep, a series ofdrills are employed, the bits of each being slightly smaller in diameterthan the preceding drill so that there may be no danger of any drilllodging in the hole. If these variations in diameter are too great, thehole will finally become unnecessarily small. It is therefore of. thegreatest importance that the drill bits should be perfectly gaged,especially for hard rock work where drill bits wear very fast and areoften changed. It is further very desirable that this gaging shall beabsolutely mechanical so that no mistake can be made by the mechanic.

In the drawings, Figure 1 shows a common form of drill sharpener,consistin of a horizontal power hammer for upsetting the worn bits ofthe drill rod, and a vertical hammer for widening and then reducing the5 wings of the bit to the exact width required.

The horizontal cylinder. 1 of the hammer is mounted on the bed 2, andthe piston rod 3 carries a die block 4:. As the dr ll rods usually havea longitudinal bore for water, a pin 5 is mounted in the die block 4 toprevent the bore being closed when the rod is being upset. A notch 6 isformed in the front end of the die block to produce the cuttlng edges ofthe drills. The rod is firmly held between jaws 7 while being upset.

After the drill rod has been upset, it is removed from the jaws 7 andits bit placed in the groove 8 of the die block 10 the piston rod 12 endof the drill rod is is held by hand against the cross bar 15. This crossbar has an air passage 16 from which air is conveyed under pressure intothe grooves 8 and 18 by means of small ducts 19 in order to blow out anyscale or dust lying in the grooves before the drill is placed therein.When the wings of the bit have been fiattened suiliciently between theupper and lower dies, the bit may be placed in the shallow notch 20,where its corners alone receive the full force of the hammer.

After. being flattened, the drill bit is placed in the groove 18 of thelower die with its wings vertical and the upper die is brought downagainst the lower die, the bit entering the groove 23 in the upper die.will be clear from Fig. 6 that the width of the bit will be determinedby its distance from the cross bar 15, and the device embodying thepresent invention perfectly regulates this distance and therefore thewidth of the bit.

Slidably mounted in the cross bar is a plunger or gager 25 havingcrossed notches 26 in its front end. This gager can he slid into thegroove 18, as indicated in Fig. 6. Its rear end is slotted to receive alink 27 to which it is connected by means of a pin 28. A. lever 29 ispivoted on the pin 30 carried by a plate 32 and bracket 33 mounted onthe anvil 34, and this lever carries a pin 35 that connects to the otherend of the'link 27. A quadrant 36 is mounted on the plate 32 and itsupper face is graduated. The lower face of the quadrant is formed withnotches 37, as indicated in Figs. 1 and 6, to receive the tongue 38 onthe resiliently mounted portion 39 of the lever 29. A pointer may bemounted on this lever. .When this lever is swung toward the lower die,the gager 25 carried by the head 11 on of the cylinder 13. The bit thedie block 9, and beneath drill bits may be quickly obtained. Severalrapidly delivered blows each are necessary to upset the drill bit, toflatten it, or to gage it, yet the entire process is, completed at oneheating of the metal.

That portion of the die having the shallow notch 20 shown in Figs. 5 and7 is often called a fuller or swaging die, and is of great importance inthe forming of drill bits, especially the sloping sides that graduallyround off in the central semi-circular notch 2-1. This notchpositivelyprevents the closing of the hole in given the propercutting'angle. The upper and lower dies are similarly formed'in thisrespect.

Where cross bits are to be sharpened, the die block shown in Figs. 3 andl may be employed. After being upset, one of the wings bit is placed inthe groove 40' of a die of the 41, two wings.lying flat on the parts 42,whereupon the upper die acts upon them to flatten them. The drill rod isthen given one quarter turn which presents the other two wings to theaction of the dies. After the wings have been flattened, the drill rodis placed in the groove 43, whereupon the width of the bit is determinedas above stated, the side grooves 44 receiving the wings not beinggaged. The gaging plunger 25 will be adjusted as before stated.

The details and proportions of this gaging device may all be modified orchanged by those skilled in the art without departingi'rom the spirit ofmy invention.

I claim: 1. The combination of relatively stationary and movablerock-drill dies having directly opposed working faces provided withgrooves having inclined bottoms,

able gaging device mounted in one of said grooves against which thedrills may be' pressed, means for moving said gaging deopposed faces,the drill steel while] the corners of the bit are being flattened andand a slidand a graduated bar whereby the position of the gaging devicemay beproperly determined.

2. The combination of relatively movable dies having opposed workingfaces provi with grooves having inclined bottoms, and a slidable gagingdevice movable independently of the dies in said grooves.

3. The combination of relatively movable dies having grooves in theiropposed faces, and a slidable gaging device movable in one of thegrooves. I

4. The combination of relatively movable dies having grooves in theiropposed faces, 'a gaging device slidable longitudinally of one of thegrooves, a lever to slide such device, and a quadrant to position thelever.

5. The combination of a stationary die and a movable die having groovesin their a plate and a graduated quadrant rigidly mounted adjacent thestationary die, a lever pivoted to said platc and adjustably held inposition by said quadrant, a gaging device slidably mounted for movementin the groove in the stationary die, and means connecting the gagingdevice to said lever.

6. The combination of a stationary die and a movable die having groovesin their vice to proper position,

' opposed faces, the bottoms of said grooves inclining in oppositedirections, a plate and a notched quadrant mounted adjacent thestationary die, a lever pivoted to said plate, means mounted on thelever to engage notches inthe quadrant to hold the lever in.

predetermined position and a gage bar connected to said lever andextending into the larger end of said groove to determine the operativelength of said dies.

7. Swa ing dies for drill rods consisting of oppose members havingregistering depressions, each provided with sloping sides that graduallyround oif in a central semicircular notch.

8. A swaging die for drill rods provided with a depression having a fiatbottom and inclined sides, one of the sides being formed with a centralsemi-circular notch.

In testimony whereof I sign this specification.

CHARLES L. LAWTON.

ded,

